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以攀枝花含钛高炉渣为原料,采用氢氧化钠碱熔法分离炉渣中的有价组分,通过对碱熔过程中不同反应阶段所形成的碱熔渣及水浸渣的结构和谱学特征进行分析和表征,研究不同温度条件下原始矿物相及中间产物的化学反应过程,揭示含钛高炉渣碱熔过程中各有价组分赋存状态的变化。结果表明:在碱熔过程中,283℃时,含钛高炉渣中透辉石相结构被破坏,Si~(4+)离子形成Na_2SiO_3可溶性盐和中间产物CaMgSiO_4,随着反应的进行,CaMgSiO_4进一步与NaOH发生反应生成难溶物Na_2CaSiO_4;当碱熔温度升高到296℃时,镁铝尖晶石中Si~(4+)与NaOH反应生成可溶性盐Na_2SiO_3;当碱熔温度为320℃时,钙钛矿晶体结构开始被破坏,Ti~(4+)离子与NaOH作用生成难溶物Na_2TiO_3,经水浸后Na_2TiO_3晶形被破坏,变为无定型结构残留于水浸渣中。
Taking the titanium-containing blast furnace slag of Panzhihua as raw material, the valuable components in the slag were separated by sodium hydroxide alkali fusion method. The structure and spectral characteristics of alkali slag and water residue formed in different reaction stages during alkali fusion Analysis and characterization were carried out to study the chemical reaction process of the original mineral phase and the intermediate product under different temperature conditions and to reveal the change of the occurrence state of various valuable components in the alkali-melting process of the titanium-containing blast furnace slag. The results show that the structure of diopside in the slag containing titanium is destroyed at 283 ℃ during alkali smelting, and the soluble salt of Na_2SiO_3 and the intermediate product CaMgSiO_4 are formed by Si 4+ ions. With the progress of reaction, CaMgSiO_4 And Na 2 CaSiO 4 reacted with NaOH. When the temperature of alkali melting increased to 296 ℃, Si 4+ reacted with NaOH to form soluble salt Na 2 SiO 3. When the melting temperature was 320 ℃, The crystal structure of perovskite began to be destroyed. Ti ~ (4 +) ion and NaOH produced insoluble Na_2TiO_3, and the Na_2TiO_3 crystal was destroyed after immersed in water, leaving the amorphous structure to remain in the water residue.